545099 - Autoconfig aka MCD: how to set unicode preferences

Status: UNCONFIRMED

(Core :: Preferences: Backend, defect)

Description

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User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.9.2) Gecko/20100115 Firefox/3.6
Build Identifier: 

I'm trying to rollout Firefox and Thunderbird to our Windows PCs (>2000, public computer labs and offices). Part of the task, is preconfiguring Thunderbird for the user's mail accounts. I'm using Autoconfig to do the task after putting all relevant information (host names, user name, address) into environment variables. 
All is fine.
However, the mail.identity.id?.fullName around here will quite often contain non-ASCII Latin-1, even Unicode characters.
My first attempt to work around this was: put the URI-encoded full name into an environment variable (encodeURIcomponent in a JScript will do the task), 
and use decodeURIcomponent on the environment variable pulled in by the autoconfigure script. This fails.
If I switch from decodeURIcomponent to unescape, things work.
Confusing...

Reproducible: Always

Comment 1

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Attachment: Windows Script Host file to set the environment

Comment 2

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Attachment: autoconfig file that works